The harmonic mean of 1, 2, and 4 is: MCQ with Answer and Explanation

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The harmonic mean of 1, 2, and 4 is:

A. 12/7

B. 7/12

C. 3/7

D. 7/3

Answer: Option A

Solution (By JKSSB Mock Tests)

HM = 3 / (1 + 1/2 + 1/4) = 3 / 1.75 = 12/7.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

In Bayes' theorem, P(A|B) is called:

A. Likelihood

B. Posterior probability

C. Marginal

D. Prior probability

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Correct Answer: Option B

Explanation:
P(A|B) updates prior using evidence, giving posterior.

This question belongs to: Accountancy and Statistics Statistics

Question #2

If the events A and B are mutually exclusive and P(A)=0.4, P(B)=0.5, then P(A∪B) is:

A. 0.1

B. 0.7

C. 0.2

D. 0.9

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Correct Answer: Option D

Explanation:
0.4+0.5=0.9.

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Question #3

WPI basket does not include:

A. Primary articles

B. Fuel and power

C. Services

D. Manufactured products

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Correct Answer: Option C

Explanation:
WPI covers goods only; services are excluded.

This question belongs to: Accountancy and Statistics Statistics

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